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CVE-2026-0561— Shield Security <= 21.0.8 - Unauthenticated Reflected Cross-Site Scripting via 'message' Parameter

Quick assessment

Affected
paultgoodchild Shield: Blocks Bots, Protects Users, and Prevents Security Breaches
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin Shield Security 21.0.8及之前版本存在跨站脚本漏洞，该漏洞源于对message参数的输入清理和输出转义不足，可能导致反射型跨站脚本攻击。

CVSS 6.1 · Medium EPSS 0.58% · P46

Public Exploits 1

Nuclei · 1 CVE-2026-0561.yaml [template]
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I. Basic Information for CVE-2026-0561

Vulnerability Information
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Vulnerability Title
Shield Security <= 21.0.8 - Unauthenticated Reflected Cross-Site Scripting via 'message' Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
The Shield Security plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'message' parameter in all versions up to, and including, 21.0.8 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress plugin Shield Security 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress和WordPress plugin都是WordPress基金会的产品。WordPress是一套使用PHP语言开发的博客平台。该平台具有在基于PHP和MySQL的服务器上架设个人博客网站的功能。WordPress plugin是一个应用插件。 WordPress plugin Shield Security 21.0.8及之前版本存在跨站脚本漏洞，该漏洞源于对message参数的输入清理和输出转义不足，可能导致反射型跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
paultgoodchild Shield: Blocks Bots, Protects Users, and Prevents Security Breaches * ~ 21.0.8 -

II. Public POCs for CVE-2026-0561

# POC Description Source Link Shenlong Link
1 Shield Security WordPress plugin <= 21.0.8 contains a reflected cross-site scripting caused by insufficient input sanitization and output escaping in the 'message' parameter, letting unauthenticated attackers inject scripts, exploit requires user interaction. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-0561.yaml POC Details
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III. Intelligence Information for CVE-2026-0561

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Patches & Fixes for CVE-2026-0561 (1)

Same Patch Batch · paultgoodchild · 2026-02-19 · 3 CVEs total

CVE-2026-0722 6.5 MEDIUM Shield Security <= 21.0.8 - Cross-Site Request Forgery to SQL Injection
CVE-2025-14427 4.3 MEDIUM Shield Security: Blocks Bots, Protects Users, and Prevents Security Breaches <= 21.0.9 - M

IV. Related Vulnerabilities

Same product: Shield: Blocks Bots, Protects Users, and Prevents Security Breaches
Same vendor: paultgoodchild
Same weakness: CWE-79

V. Comments for CVE-2026-0561

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